Overedge sewing machine



March 20, 1928. 1,663,489

J. BERGER OVEREDGE SEWING MACHINE Filed July 30. 1924 4 Sheets-Sheet 1 March 20, 1928. 1,663,489

J. BERGER OVEREDGE SEWING MACHINE Filed July 30. 1924 4 Sheets-$heet 2 Guo mua-s March 20, 1928.

J. BERGER OVEREDGE SEWING MACHINE Filed July 50. 1924 4 Sheets-Sheet 3 March 20, 1928.

J. BERGER OVEREDGE SEWING MACHINE 4 Sheets-Sheet 4 v Filed July 50. 1924 aimmri fit) ii ii Patented Mar. 20, 1928.

JOSEPH BERGER, OF UTICA, NEW YORK,

ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, ACORPOBATION OF ILLINOIS.

Wanner: -5.EWI.NG MAOHINE- Application filed July 30,

The invention relates to new and useful nnprovemente in trunnnng mecl'iamsms for sewing machines, and iinore part cularly to a trin'nning mechaniem which is adapted to trim an edge of fabric or the like in advance of an overedge stitching mechanism.

in object of the invention is to provide a trimming mechanism of the above character wherein the movable trimming bladev's carried by a swinging arm which is relatively short and the pivot oi? which is disposed in the plane of the support for the hibric being trinini'ied.

A "further object of the invention is to provide a trimming mechanismwherein the trimming blade moves from a point Well above the fabric and the stationary blade down into cooperative action therewithand whereinmeans independent oil. the trimiining blade is provided for yieldii gly holding the movable blade in proper alineinent :t'or co- (operation with the stationary blade.

4 still further object of the invention is to provide a trimming mechanism of the above type with a trii'nming blade, the body oi which is located in plane inclined to the plane oi the stationary blade, and wherein the cutting edge of the movable blade lies in a plane parallel with the stationary blade.

still further objcctof the invention is to provide a n'iovable trimming blade and ,a guide plate or bar which associated therewith and which iscarried by the mechanism which reciprocates the movable blade, and wherein said guide plateorbarisadjustable independently of the trimming blade and is adaptei'l to bear continuously against the stationary trin nning blade.

A still. further object oi? the invention is to provide a sectional Silli p guide for guiding the trimmed oil strip away i'rom the stitchii mechai iism in rear thereol'.

'llh and other objects will in part be obvious will inpart be hereinafter more f a l disclosed.

in the drawings which show by way 01'' iliflz tration one embodiment of? the invenlioo-- m Figure .l in a front view of a sewing machine embody ng" my improvements;

Fig. i) is a sectional. view on the line 2--2 of Fig. l

is a sectional view on the hue 3V-.-.3

of Fig. at;

it is an end View of a portion of the tive to each other.

cutting cd e and thiscut 1924. SeriaLNo. 729,100.

lnacliinmbut with the cover plate swung out in order to disclose the operating parts in rear thereof;

Fig. 5 is anenlarged end view of a portion of the machine with the end of the cover plate 111 normal position;

.Fig. 6 is a sectional viewon the line (36 oi Fig. 3;

Fig. .7 is a sectional view on the line 7-4 of Fig. (5; and

Fig. 8 is anenlargedidctail in plan show ing the presser foot, the cloth supporting plate, the movable trimming blade and the aection of fabric which is being trimmed and theedge thereof covered by the stitching mechanism.

The invention is directed broadly to a trimn'iingmechanism for a sewingmachine,

and 1110!.9litlltlcllltlltly to a trin'u'ning mechanism which adapted to .trim the edge of a fabric, which edge is sul'isequentiy covered by stitching. In carrying out the invention, the machine is provided with a cloth plate which SlTlPPOIYlIEl the fabric to be trimmed.and stitched. The eiflgc is covered by ;a stitching mechanism which "forms a series of connected thread loops extending around the edge to be covered. The material is fed across the cloth plat-eby a (litterential feeding mechanism consisting of two feed dogs one in advanceof the stitching mechanism and the other in rear thereo lf, and these qfecd dogs are so operated that they maybe given a differential movement rela- The material is held on the cloth plate or work support by means of a presser ifoot which is provided with a yieldingsection. The cloth plate is carried by a supporting post rising from the bed plate ot the machine at the forward side thereof. d\[()lll1lf(i on this supporting post is a. stationary member of the tzwin'imiu-g mechanism. i it isprolei-ably arcshe ed, and the upper end thercoi it; provided with a ng oi located sli. t y below. but adpwout the upper sucface ot the cloth plat Cooperat' ing with this stationary cutting blade is a movable blade. which is carried by an arm mounted on ashaft pivoted so as to owing about an axis which lies in the plane containing the cloth plate. Thearm is relatively short, so that the trimming member may be n'ioved downwardly to cut the fabric with considerable force. The movable blade is set at an incline to a plane containing the stationary blade and has its cutting face lying in a-plane parallel with the outer face of the stationary blade. Said movable blade swings from a position where it cooperates with the stationary blade to a position a considerable distance above the cutting edge of said blade. Said movable cutting blade is held in proper alinement for cooperative action on the stationary blade by a guide or bar which is mounted to reciprocate with the movable blade and which maintains its contact with the stationary blade. Said bar or plate is yieldingly pressed against the stationary blade by a spring which bears against the end of the shaft which carries this guide plate and also the movable cutting blade.

Referring more in detail to the drawings, I have shown the invention as applied to a sewing machine having a bed plate 1 on which is mounted an overhanging arm 2 which carries a needle bar 3 at its outer end. Said needle bar is reciproeated by a needle lever t pivoted at 5 on a bracket 6, and said lever is oscillated by means of an eccentric strap 7 cooperating with an eccentric 8 on the main shaft 9. The reciprocating needle bar 3 carries a needle 10. Cooperating with the needle 10 beneath the work support is a thread carrying looper 11, which thread carrying looper 11 is rigidly carried by a short shaft 12 which in turn is mounted on a sleeve bearing 13 and is operated by a tog gle lever mechanism 1 1. Cooperating with the under looper 11 and the needle 10 is an overedge looper 15. This overedge looper 15 is actuated from a shaft 16 mounted in a bracket 17. The shaft 16 carries an arm 18 which is connected to an eccentric strap 19 cooperating with an eccentric 20 on the main shaft 9.

This stitching mechanism forms no part of the present invention, but is shown, described and claimed in my co-pending application, Serial No. 729,099, filed of even date herewith.

The material to be trimmed is supported by a cloth plate 21. The cloth plate 21 is supported in part by an upwardly extending bracket 22 which carries a lug 23. A screw 24 is threaded through the outer end of the cloth plate and into the lug 23.

The trimming mechanism consists of a movable blade and a stationary blade 26. This supporting bracket is provided with an arc-shaped recess which receives the stationary trimming blade which is also areshapcd. A clamping plate 27 overlies the stationary blade and is drawn against the same by a clamping bolt 28 which is thread ed through this bracket 22 (see Figures 4, 6

and 7). The upper edge of the stationary cutting blade is beveled as indicated at 29 (see Fig. 7 Cooperating with this stationary blade 26 is a movable blade lit). I aid movable blade 30 as clearly shown in Fi T is located in a plane which cuts the plane of the stationary cutting blade at an acute angle. The cutting edge of this movable blade, however, which is indicated at 31 lies in a plane parallel with the front face of the stationary blade. This movable cutting blade is carried by an arm $52. The arm 32 is in turn carried by a sleeve 3? which is rigidly secured to a short shaft. iiiby means of a set screw 35. This shaft It! is mounted in spaced bearings 36 and -57 (see Figures 1 and Mounted on the shaft between the spaced bearings is a collar :38 which carries an arm 39. At the upper end of the arm 39 is a ball stud ll) to which a link ll is connected. This link -11 is con.- nected at its other end to a ball stud 12 shown in dotted lines in Fig. 2. This ball stud is carried by an arm 43 which is rigidly mounted on the shaft us. As has been described above, this shaft lti is oscillated by the eccentric strap 19. and as the shaft oscillates, it swings til. arm 4:3 which moves the link 4:1 endwise, and this in turn oscillates the shaft 3i carrying ti 2 arm 32. The up per end of the arm 32 is formed with a head. 14. Said head 4'4: is provided with a recess 45 in which the movable trimn'iing blade tit) is located. Said blade is held in this lcccss by a clamping plate +16 which is secured to the head by means of a clamping bolt ti. It will be noted from Figures 1 and T of the drawings that this movable blade tit) moves from a position well above the stationary blade to a position where said movable blade performs a shearing cut in cooperation with said lower stationary blade. The cutting edges of the two blades are substantially parallel and there is no guiding linger on the movable blade to limit the extent of the cutting action of the two blades and furthermore there is no guiding linger on the movable blade to interfere with the proper sharpening of the blades. The two blades are maintained in proper alincmcnt by :in independent guide plate or bar its which is carried by the supporting head l t. Said head 44L is undercut as indicated at it) in Fig. 2, and the guide plate or bar is is mounted in this undercut portion as clearly shown in said figures. Said guide plate or bar is provided with a slot through which a screw 51 passes to secure said plate or bar to the head 14. This slot permits the guide plate or bar to be adjusted in a direction at rightangles to the plane of the cooperating cutting blades. Inasmuch as it is independently mounted and separate from the cutting blade. it can be adjusted to properly aline the blades without shifting the inorable blade. It can also be set so as to prevent undue wear of the movable blade in its shearing action with the stationary blade.

ti ll The shaft 34: which carries the movable blade is capable of endwise movement to a limited extent in the bearings 36 and 37 and ismoved in a direction so asto hold this guide bar or plate in. contact with the stationary blade or the parts in alinement therewith by means of a spring 52. Said spring 52 is fulcruined at 53 on the stationary part of the machine and a threaded nut 54 carried by a screw 55 bears against the spring between its ends, and may be utilized for varying the tension of the spring on the shaft. This spring presses the shaft endwise toward the left as viewed in Fig. 'l, and this endwise movementof the shaft is limited by the adjustable plate or bar 48.

The material. to be stitched is held on the cloth plate 21 by means of a presser foot 56 and the material is fed across the cloth plate by means of feed dogs 57 and 58. These feed dogs are mounted so that one is located in rear of the needle and the other in front thereof, and said teed dogs may be given a differential feeding movement, it d sired. The feeding incclmnism forms no part of the present invention, but is shown, described. and claimed in a co-pending application, Serial No. 729,101, filed of even date herewith.

The material to be stitched is indicated at F in the drawings (see Fig. 8), and the overedge stitches for covering the trimmed edge are indicated at S. In order to keep the trimmed o'if strip f from passing back and interfering with the stitching mechanism or the operating parts of the machine, I have provided a strip guide or cover plate 59. Said cover plate includes a vertical portion (50 which is hinged to the bed plate 1 by suitable hinges 61,61. This cover plate as clearly shown in Figure 6 extends up wardly to form said vertical portion and is then inclined inwardly, and when in closed position, is adapted to bear against a supporting bracket .62. Said supporting bracket .62 is secured to the bracket 22 which supports the front end of the cloth plate, and also the stationary trin'nning member. Eiaid supporting bracket 62*is provided with a laterally projecting portion (53 which is secured. to the bracket 22 by means of a screw 63.

Said strip guide is also provided with a movable section 64 (see Figures 2, 3, (i and oi the drawings). This movable smvtjou is mounted on a supporting plate 65 which is formed as apart of the front cover-plate b9. and is secured thereto by a pivot screw (-36. The movable section 65 is spring pressed in an upward direction by means ot a spring 67 which surrounds a rod 68 mounted. on the inner face of the cover plate 59. The movable section of the cover plate is limited in its upward movement by a lug 69 carried by the supporting plate 65, Said movable section may be moved dowmvardly against the tension of the spring 671 by means off a finger piece 70 (see Fig. 1).

It will be noted from Figures and 6 of the drawings that this movable section (it the cover plate extends to a point adjacent the cutting edge of the lower or stationary cutting blade and is located in behind the guide bar or plate 48. Inasmuch as the guide bar or plate 48 is located in front oi? the movable section 64; of the strip guide, said bar or plate will engage the trimmed o'tt' strip and positively force the same downwardly along the front face oil? the strip guide. Thus it is that this guide bar prevents the trimmed otl strip from, in any way, working in behind the side edge of the strip guide and beneath the work support. W hen it is desired to uncover the parts in rear of the strip guide, the movable section is depressed through the aid of the finger piece (jrarried thereby so as to move it from behind the guide bar or plate is.

i hinges (31 so as to uncover the parts in rear thereof. In Fig. .2 I have shown the combined strip guid and cover plate in its normal position for deflecting the trimmed cit strip toward the front of the machine, and in dotted lines, I have shown. this strip guide and cover plate as moved. to a position to expose the parts in raw thereof. The cover plate ()0 is held in closed position by means of a spring latch 71 attached to the bracket carrying the bearings 36 and 37. The cover plate has an integral finger piece 72 with a slot formed therein which takes over this spring latch.

It wiil be noted from Figures 3, 4: and 5 that the shaft which supports the movable trimn'iing blade is substantially in the plane of the cloth plate and is in. advance of the stitching mechanism. The arm 32 which carries the movable trimn'iing blade is relatively short. This can be made short for the reason that the range of oscillation of the movable blade can be made relatively large, iijiasmuch as there is means for bolding the movable blade and stationary blade in. proper alinement. hilc I have described the trimming moclianism in conjul'lffl i nll Willi an overedgc machine, it will be understood that it may be used with other ty i stitcl'iing mechanisms. bile .l have shown and described a (lifit'ercntial. 'l'ecdig mechanism zi'or niovi the material across the cloth plate, it is obvious that, tron-i certain aspects of the invention, the two teed dogs may be moved in unison, or a. single teed dog oi. the ordinary construction may be used instead of the two teed dog diii'crentia]. feeding mechanism.

It is-obvious that minor changes in the details 01? construction may be made with 'lhon the cover plate can be swung on 4 out departing from the spirit of the invention as set forth in the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters-Patent, is

1. A trimming mechanism for sewing machines comprising an upper movable trimming blade and a lower stationary cooperating blade, means for supporting and moving said upper blade from a position well above said stationary blade into cooperative cutting action therewith, and means independent of and movable with said movable blade for maintaining said movable blade in proper alinement with the stationary blade do big the entire movement or" said movable blade.

2. A'trimming mechanism for sewing machines comprising an upper movable trimming blade and a lower stationary cooperating blade, means for supporting and movsaid upper blade from a position well above said stationary blade into cooperative cutting action therewith, means independent of said movable blade for maintaining said movable blade in proper alinement with the stationary blade, and means for yieldingly moving said movable cutting blade in a direction toward the stationary blade.

3. A trimmin mechanism for se ing machines comprising an upper movable trimming blade and a lower stationary cooperating blade, means for supporting and moving said upper blade from a position well aoove said stationary blade into cooperative cutting action therewith, and means independent of said movable blade for maintaining said movable blade in proper alinement with the stationary blade, during the entire movement of said movable blade, said supporting means for the movable blade being constructed so that said movable blade eX- tends at an acute angle to the plane of oscillation of the blade, the cutting edge of said movable blade being beveled so as to lie in a plane coincident with the cutting face of the stationary blade.

l A trimming mechanism for sewing machines including in combination, an upper trimming blade, a lower cooperating blade, a shaft extending atright angles to the cutting plane of said blades, anarm mounted on said shaft and having a trimmer head for supporting the movable trimming blade, means or yieldiugly pressing said shaft toward the stationary trimmingblade. and means independent of the movable blade for limiting the endwise movement of said shaft and for maintaining said trimming blades in cooperative cutting relation.

5. The combination with stitching mechanism; of a trimming mechanism, located in advance of the stitching mechanism and including a movable trimming blade and a stationary trimming blade, ashaft, a trimmer head mounlcd on said shalt and carrying said movable trimming blade, means for oscillating said shalt. yielding means for moving said shall; endwise for maintaining said trimming blades in cutting relation to each other, and means independent of the trimming blades tor limiting the endwise movement of said shaft and maintaining said blades in proper alinement.

l. The combination with stitching mecluu nism: ol a trimming mechanism located in advance ol the stitching mechanism and including a movable trimming blade and a slationary trimming blade, a shaft, trimmer head mounted on said shaft and c rryiug said movable trimming blade, means for oscillating said shalt. yielding means for moving said shaft endwise for imiiutaining said trimming blades in cutting relation to ach other, means independent of the {rimming blades for limiting the endwise movement of said shaft and maintaining said blades in proper aliuemenl', and devices whereby said lasbnamcd means can be adjusted.

7. The combination with stitching mechanism; of a trimming mechanism located in advance of the stitching mechanism and including a movable trimming blade and a slationary trimming blade, a shalt. u trimmer head mounted on said shaft and carrying said movable trimming blade. means l'or oscillating said shatt, yielding means 'l'or moving said shaft endwise for maintaining said trimming blades in cutting relation in (ill'll other, and means independent oi the trimming blades for limiting the endwise movement of said snalt and maintaining said blades in proper alincmenl', said movable blades being mounted on the trimmer head so to lie at an acute angle to the culling: plane and having its cutting i'acc parallel with said cutting plane.

8. The con'ibination with stitching lllll'llanism: of a trimming mechanism having trimming blades located .in advance o'li said stitching mechanism, movable means on which one of said trimming blades is mounted, said movable means being couslrui-lml so that said movable blade moves from a position well above said (,'()(l]l(l2 i'lll.l' blade inlo cutting relation thcrewilh, and means indoi'ieudcnt oi said blades For maiuiaiuiim' (be same in proper culling aliiicmont durim); lhv entire movement oi said movablc blade.

ii. A lrimmiug mcchzuism including in combination. a lower stationary culling blade, an upper movable culling blade. an scillal-ing arm on which said movable blade is mounted, said movable blade being sol al an acute angle to the cutting plane and having its cutting vface parallel with said plane. means for yieldingl v pressing said movable blade toward the stationary blade for maintaining said blades in proper cutting relallll tion, and. adjustabli'i means movable with said upper blade for maintaining said bladt-is in proper alinemente i 10. A trimming mechanism including in combination, a lower stationary cutting blade, an upper movable cutting blade, an oscillating arm on which said movable blade is mounted, said movable blade being set at an acute angle to the cutting plane and having its cutting face parallel with said plane, means for yieldingly pressing said movable blade toward the stationary blade for maintaming said blades in proper cirtting relation, a guiiile bar nuivable with said upper blade and extending at right angles to the cutting plane for maintaining d movable blade in proper alinement with the stationary blade. i

11. A trimming mechanism inchiding in coml'iination, a cloth plate, an adjustable stationary blade located beneath the cloth plate, an upper movable blade cooperating \vith said stationary blade, an oscillating shaft, an arm carried by said shaft and having a trinnner head onwhich said movable blade is mounted, said movable blade being set at an acute angle to the plane of oscillation thereof and having its cutting face located in said cutting plane, a guidebar carried by said trimmer head and extending at right angles to the cutting plane, means whereby said guide bar can be ad justed, and yielding means for moving the trimmer head so as to press said guide bar into contact with the stationary blade and thus maintain said cutting blades in proper cutting relation to each other.

12. A trimming mechanism including in combination, a cloth supporting plate, a lower stationary arc-shaped cutting blade, an upper movable cutting blade, a shaft, an arm carried by said shaft and supporting said movable trimming blade, said movable trimming blade being set at an acute angle to the plane of oscillation of said blade and having its cutting face parallel, with said plane, a guide bar carried by said arm and extending at right angles to the cutting plane, and yielding means for forcing said shaft endwise and for holding said guide bar in contact with said stationary blade whereby said guide bar properly alincs said cutting blades relative to each other.

13. A trimming mechanism including in combination, an upper movable trimming blade and a lower stationary trimming blade, a shaft located at the front of the machine, an arm carried by said shaft and extending rearwardly on which said movable cutting blade is mounted, means for oscillating said shaft, yielding means for moving said shaft endwise for maintaining the cutting blades in proper cutting relation to each other, and means independent of said movable trimming blade for limiting the endwise movement ofsaidshaft.

let. A sewing machine including in combination, a cloth plate, over-edge stitching mechanism, a trimming mechanism located in front of said over-edge stitching rncchanism and including a lower stationary blade and an upper movable blade, ashaft at the front ofthe cloth plate and having arearwardly projecting arm on which said movable blade is mounted, meansfm' yield ingly niroving said sh aft in an endwise d irection, a guide bar carried by said arm and adapted to engage the stationary blade for limiting-the movementof the shaft so as to properly hold said blades in cuttirigrel ation to'each other, a cover plate hinged at the front of the machine, a strip gilide' mounted on said cover plate and adapted to extendin rear of said guide bar so as to en gage and deflect downwardly and forwardly the trirnmed =oll' strip, said strip guidielie i'ng yieldingly mounted on the cover plate and adapted to swingabout an axis coincjident with the axis of the shaft carrying the movable trimming member whereby said strip guide can be loweredso as topermit the clothplate to be swung in a forward direction to uncover the parts in rear thereof.

15. A sewing machine including in combination, a cloth plate, overedge stitching mechanism, a trimming mechanism located in front of said overedge stitclring mechanism and including a lower stationary blade and an upper movable blade, a shaft at the front of the cloth plate and" having a rearwardly projecting arm on which said movable blade is mounted, means for yieldingly moving said shaft in an endwise direction, a guide bar carried by said arm and adapted to engage the stationary blade for limiting the movement of the shaft so as to properly hold said blades in cutting relation to each other, a cover plate hinged at the front of the machine, a strip guide .lllOlllltt-ll on said cover plate and adapted to extend in rear of said guide bar so as to engage and deflect downwardly and forwardly the trimmed olf strip, said strip guide being yielding-1y mounted on the cover plate and adapted to swing about an axis coincident with the axis of the shaft carrying the movable trimming member whereby said strip guide can be lowered so as to permit the cloth plate to be swung in a forward direction to uncover the parts in rear thereof, and a yielding latch for holding said cover plate in closed position.

16. A trimming mechanism comprising a cloth plate, a supporting bracket for said cloth plate, trimming blades, means for supporting and operating the trimming blades so as to sever the fabric adjacent the edge of the cloth plate, a cover plate at the cloth plate, trimming blades, means for supporting and operating the trimmin blades so as to sever the fabric adjacent tlie edge of the cloth plate, a cover plate at the front of the machine and having a depressed portion adjacent the edge of the cloth plate, a strip guide mounted on the cover plate and extending into said depressed portion for deflecting the trimmed off strip toward the front of the machine, said strip guide being pivotally supported by the cover plate, and a spring for normally swinging said strip guide in an upward direction to position the same for properly engaging the trimmed ofi' stri I 18?. A trimming mechanism comprising a cloth plate, a supporting bracket for said cloth plate, trimming blades, means for supporting and operating the trimming blades so. as to sever the fabric adjacent the edge of the cloth plate, a cover plate at the front of the machine and having a depressed portion adjacent the edge of the cloth plate, a. strip guide mounted on-the cover plate and extending into said depressed portion for deflecting the trimmed off strip toward the front of the machine, said strip guide being pivotally supported by the cover plate, a spring for normally swinging said strip guide in an upward direction to position the same for properly engaging the trimmed oti' strip, and a supporting ledge mounted on the support for the cloth plate against which said cover plate bears when in closed position.

19. A sewing machine including in combination a trimming mechanism having an upper movable trimming blade, a bar independent of and located beneath said movable trinnning blad and 1m able with and oper ating to guide said trimming blade in its up and down movements, a strip guide located in rear of said bar so that the trimmed off strip is deflected downwardly by said bar in its up and down movements and positively caused to travel along the t'ront fare of said strip guide.

20. A sewing machine including in combination, a work support, trimming mechanism for trin'uning the edge of the fabric p 'ior to the stitching thereof including eooperating trimming blades, a strip guide mounted at the edge of the work supportfor receivineand directing the trimmed oil strip away from the trimmingmechanism. said trimming mechanism having a movable member independent of said trimming blades adapted to engage the trimmed oti' strip for positively directing the same against the front face of the strip guide.

In testimony whereof, I aflix mv signature.

JOSEPH BERGER. 

